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__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
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\___ __|__ / \ \___
__________________________________________________________
INFORMATION BULLETIN
HP Current Directory Vulnerability
HP Daily Security Bulletins Digest HPSBUX9907-100
July 22, 1999 23:00 GMT Number J-053
______________________________________________________________________________
PROBLEM: The current directory is in the root user's PATH after logging
in using CDE. The root user should not have the current
directory in the PATH.
PLATFORM: HP 9000 series 700/800 at HP-UX revision 10.X.
DAMAGE: Potential for unauthorized increase in privileges.
SOLUTION: Modify /usr/dt/bin/Xsession as indicated in the bulletin until
a patch is available.
______________________________________________________________________________
VULNERABILITY The risk is Medium because there are several possible ways
ASSESSMENT: that a user can get an unauthorized increase in privileges
through this PATH problem. The workaround should be used
until a patch is available.
______________________________________________________________________________
[ Start Hewlett-Packard Advisory ]
Digest Name: Daily Security Bulletins Digest
Created: Tue Jul 20 3:00:02 PDT 1999
Table of Contents:
Document ID Title
- --------------- -----------
HPSBUX9907-100 CDE Leaves Current Directory in root PATH
The documents are listed below.
- ------------------------------------------------------------------------------
- -
Document ID: HPSBUX9907-100
Date Loaded: 19990719
Title: CDE Leaves Current Directory in root PATH
- -------------------------------------------------------------------------
**REVISED 01** HEWLETT-PACKARD COMPANY SECURITY BULLETIN: #00100, 07 July 1999
Last Revised: 19 July 1999
- -------------------------------------------------------------------------
The information in the following Security Bulletin should be acted upon
as soon as possible. Hewlett-Packard Company will not be liable for any
consequences to any customer resulting from customer's failure to fully
implement instructions in this Security Bulletin as soon as possible.
- -------------------------------------------------------------------------
PROBLEM: The current directory is in the root user's PATH
after logging in using CDE.
PLATFORM: HP 9000 series 700/800 at HP-UX revision 10.X
DAMAGE: Increase in privileges..
SOLUTION: Modify /usr/dt/bin/Xsession until a patch is available.
AVAILABILITY: This advisory will be updated when patches are available.
CHANGE SUMMARY: HTML to text conversion instructions for script added.
- -------------------------------------------------------------------------
I.
A. Background - The PATH environemnt variable is constructed from
several sources including dtsearchpath and scripts in
/etc/dt/config/Xsession.d/ and /usr/dt/config/Xsession.d/.
The resulting PATH contains the string "::" which will be
interpreted as the current directory. The root user should
not have the current directory in the PATH.
B. Fixing the problem - Since the PATH environment variable can be
affected by dtsearchpath and several scripts, the recommended
solution is to clean up the root user's PATH after is has been
created.
**REVISED 01**
Note: This file is in HTML format. If you are editing
the text version from a mailing the line below:
for (i=1; i<=n; i++) {
must be changed. Replace the characters between
the second "i" and the "=n" with the single "less than"
character (ascii 0x3c).
The line will then read:
for (i=1; iX=n; i++) {
where X stands for the "less than" character.
In /usr/dt/bin/Xsession just before this:
# ###########################################################################
#
# Startup section.
Add this:
###################### Clean up $PATH for root ##########################
if [ "$USER" = "root" ]
then
Log "Clean up PATH for root user"
Log "Old PATH = $PATH"
PATH=`echo $PATH | awk '
{
# Remove elements from PATH that are
# (a) "."
# (b) ""
# (c) blank
#
gsub (" ",":", $0) # Substitite ":" for each blank
n = split ($0, path, ":") # Split into elements with ":" as delimiter
first = 1 # To suppress leading ":" in new PATH
for (i=1; i<=n; i++) {
len = length(path[i])
dot = index(path[i], ".")
dot_only = 0
if ((len == 1) && (dot==1)) {
dot_only = 1
}
# print element if it is not "" and not "."
if (!(len==0) && !(dot_only==1)) {
if(first != 1) {
printf (":") # if not first element, print ":" in front
}
printf ("%s",path[i])
first = 0
}
}
}
END { printf ("\n") }'`
Log "New PATH = $PATH"
fi
###################### End - Clean up $PATH for root ####################
C. To subscribe to automatically receive future NEW HP Security
Bulletins from the HP Electronic Support Center via electronic
mail, do the following:
Use your browser to get to the HP Electronic Support Center page
at:
http://us-support.external.hp.com
(for US, Canada, Asia-Pacific, & Latin-America)
http://europe-support.external.hp.com (for Europe)
Login with your user ID and password (or register for one).
Remember to save the User ID assigned to you, and your password.
Once you are in the Main Menu:
To -subscribe- to future HP Security Bulletins,
click on "Support Information Digests".
To -review- bulletins already released from the main Menu,
click on the "Search Technical Knowledge Database."
Near the bottom of the next page, click on "Browse the HP
Security Bulletin Archive".
Once in the archive there is another link to our current Security
Patch Matrix. Updated daily, this matrix categorizes security
patches by platform/OS release, and by bulletin topic.
The security patch matrix is also available via anonymous ftp:
us-ffs.external.hp.com
~ftp/export/patches/hp-ux_patch_matrix
D. To report new security vulnerabilities, send email to
security-alert@hp.com
Please encrypt any exploit information using the security-alert
PGP key, available from your local key server, or by sending a
message with a -subject- (not body) of 'get key' (no quotes) to
security-alert@hp.com.
Permission is granted for copying and circulating this Bulletin to
Hewlett-Packard (HP) customers (or the Internet community) for the
purpose of alerting them to problems, if and only if, the Bulletin
is not edited or changed in any way, is attributed to HP, and
provided such reproduction and/or distribution is performed for
non-commercial purposes.
Any other use of this information is prohibited. HP is not liable
for any misuse of this information by any third party.
________________________________________________________________________
- -----End of Document ID: HPSBUX9907-100--------------------------------------
[ End Hewlett-Packard Advisory ]
______________________________________________________________________________
CIAC wishes to acknowledge Hewlett-Packard for the information contained in
this bulletin.
______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
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FAX: +1 925-423-8002
STU-III: +1 925-423-2604
E-mail: ciac@llnl.gov
For emergencies and off-hour assistance, DOE, DOE contractor sites,
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Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
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CIAC has several self-subscribing mailing lists for electronic
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PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
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J-045: Vulnerability in statd exposes vulnerability in automountd
J-046: HP-UX VVOS NES Vulnerability
J-047: The ExploreZip Worm
J-048: Malformed HTR Request Vulnerability
J-049: Windows NT, Two Denial-of-Service Vulnerabilities
J-050: HP-UX Visualize Conference Vulnerability
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J-052: SGI arrayd default security configuration
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